From: Haihao Xiang <haihao.xi...@intel.com>
Signed-off-by: Haihao Xiang <haihao.xi...@intel.com>
---
doc/ffmpeg.texi | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index 7246a46d2f..d086d2e554 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -1406,16 +1406,38 @@ If not specified, @samp{auto_any} is used.
platform-appropriate subdevice (@samp{dxva2} or @samp{d3d11va} or
@samp{vaapi}) and then deriving a
QSV device from that.)
-Alternatively, @samp{child_device_type} helps to choose platform-appropriate
subdevice type.
-On Windows @samp{d3d11va} is used as default subdevice type.
+The following options are recognized:
+@table @option
+@item child_device
+Specify a DRM render node on Linux or DirectX adapter on Windows.
+@item child_device_type
+Choose platform-appropriate subdevice type. On Windows @samp{d3d11va} is used
+as default subdevice type when @code{--enable-libvpl} is specified at
configuration time,
+@samp{dxva2} is used as default subdevice type when @code{--enable-libmfx} is
specified at
+configuration time. On Linux user can use @samp{vaapi} only as subdevice type.
+@end table
Examples:
@table @emph
+@item -init_hw_device qsv:hw,child_device=/dev/dri/renderD129
+Create a QSV device with @samp{MFX_IMPL_HARDWARE} on DRM render node
@file{/dev/dri/renderD129}.
+
+@item -init_hw_device qsv:hw,child_device=1
+Create a QSV device with @samp{MFX_IMPL_HARDWARE} on DirectX adapter 1.
+
@item -init_hw_device qsv:hw,child_device_type=d3d11va
Choose the GPU subdevice with type @samp{d3d11va} and create QSV device with
@samp{MFX_IMPL_HARDWARE}.
@item -init_hw_device qsv:hw,child_device_type=dxva2
Choose the GPU subdevice with type @samp{dxva2} and create QSV device with
@samp{MFX_IMPL_HARDWARE}.
+
+@item -init_hw_device qsv:hw,child_device=1,child_device_type=d3d11va
+Create a QSV device with @samp{MFX_IMPL_HARDWARE} on DirectX adapter 1 with
subdevice type @samp{d3d11va}.
+
+@item -init_hw_device vaapi=va:/dev/dri/renderD129 -init_hw_device
qsv=hw1@@@var{va}
+Create a VAAPI device called @samp{va} on @file{/dev/dri/renderD129}, then
derive a QSV device called @samp{hw1}
+from device @samp{va}.
+
@end table
@item opencl
--
2.34.1
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